Spatiotemporal variations of potential evapotranspiration and its climate influencing factors in Hebei Province
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Abstract:
The potential evapotranspiration is an important basis for determining the crop water demand.Accurate estimation and attribution its meteorological influencing factors are of great significances for optimizing the adjustment of agricultural planting structure and rational allocation of water and soil resources.The spatiotemporal variations of potential evapotranspiration and its climate influencing factors in Hebei Province were investigated based on daily weather data from 1960-2016 at 24 meteorological stations in Hebei Province and adjacent administrative regions,Penman Monteith formula sensitivity coefficient,and contribution rate.Results showed that the average ET0 in Hebei Province was 1095.70 mm in the past 57 years.It showed an overall downward trend with an average magnitude of -8.905 mm/（10a）.The ET0 change rate of was the highest in summer season and the lowest in winter season.The spatial distribution showed a general semi circular decreasing trend from west to east,and its seasonal variations were basically consistent with that of annual scale.The annual average ET0 was negatively sensitive to relative humidity and positively to other meteorological factors.The sensitivity of each meteorological factor was:relative humidity>maximum temperature>average wind speed>sunshine hours>average temperature>minimum temperature.The average wind speed was the dominant factor for the change of ET0 in the whole year and in spring,autumn and winter seasons.Sunshine hours were the dominant factor for the change of summer ET0.In terms of spatial distribution,the dominant factor of ET0 variation in the northwestern region was the average temperature,the northeastern region the sunshine hours,and the central and southern regions the average wind speed.The results can provide theoretical supports for the optimal allocation of water resources and regional drought assessment.
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